DuPont Viton is used for the O-ring and piston cup to provide superior resistance to the harshest chemicals, even D-limonene. High density polyethylene tank is more resistant to breaks than other materials. 4" (10cm) wide funnel top for quick, easy filling and adjustable nozzle allows user to control output and reduce the waste of chemicals, saving time and money. Sprayer/Hose/Nozzle Type: Tank Sprayer; Sprayer/Nozzle Type: Adjustable; Nozzle/Sprayer Settings: Adjustable Fine Mist to Stream; Hose Diameter: 5/8".